为什么我转的720*480的片子PSP放不了？

Command0=""<%AppPath%>\cores\ffmpeg14277" -y -i "<%InputFile%>" -title "<%Title%>" -timestamp "<%TimeStamp%>" -vcodec libx264 -flags +loop -cmp +chroma -deblockalpha 0 -deblockbeta 0 -coder 1 -refs 2 -aspect 1:1 -me umh -me_range 16 -level 30 -bf 3 -wpred -brdo -subq 1 -directpred 2 -trellis 2 -partitions partp8x8+partb8x8+parti4x4 -threads 2 -bufsize 10000k -g 300 -r 29.97 -b 1200kb -bt 256k -acodec libfaac -ac 2 -ar 48000 -ab 128k -f psp -vol 300 "<%OutputFile%>.MP4""